S-LAL21 which has improved on chemical durability & mechanical properties and is ideal for polished lenses of Automotive.
05.18.2018
S-LAL21 is an optical glass for polished lens which has improved on water resistance, acid resistance and mechanical strength required for Automotive camera lenses. Existing glasses at the region of LAL are not so good in acid resistance and the class of the powder method Acid resistance of it is 4 or 5. The current LAL glasses may be difficult to be used for some kinds of Automotive camera lenses. S-LAL21 has improved on chemical durability, that’s why it could be used for Automotive camera lenses, as well as projectors, photographic interchangeable lenses and various applications.
(Advantages)
1.Excellent chemical durability
Powder method Acid resistance is improved to Class 1 at the region of LAL
Powder method Water resistance is improved to Class 1 at the region of LAL
2.High Mechanical Strength
Knoop Hardness 690, Class7 Abrasion 60
| S-LAL21 | ||
| Eco Optical Glass | ○ | |
| Refractive Index nd | 1.70300 | |
| Abbe Number νd | 52.38 | |
| CTE α (10-7/℃) |
-30～70℃ | 50 |
| +100～300℃ | 61 | |
| Transformation Point Tg(°C) | 767 | |
| Yield Point At(°C) | 814 | |
| Coloring | λ80 | 395 |
| λ5 | 320 | |
| Chemical Resistance | RW(P) | 1 |
| RA(P) | 1 | |
| W(S) | 2 | |
| SR | 4.0 | |
| PR | 1.0 | |
| Specific Gravity | 3.85 | |
| Knoop Hardness Hk | 690[7] | |
| Abrasion Aa | 60 | |
| Detail Catalog DATA | ||
| Available shapes | •pressing •saw cut center-less ground cylindrical blanks •cut blanks |
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(Please consult us about available size and tolerance.)